All the bitstream files included in this directory that follow the name pattern fpgaminer_*.ncd are:

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Copyright (c) 2011-2012 fpgaminer@bitcoin-mining.com

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

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You can find the original sources at the Open Source FPGA Bitcoin Miner project GitHub repository:
https://github.com/progranism/Open-Source-FPGA-Bitcoin-Miner/tree/master/projects/X6000_ztex_comm4/hdl